Winchester Climate Normals – Illinois State Climatologist

Official 1981-2010 Climate Normals

City: WINCHESTER
State: IL
ID: 119331
Latitude: 39.6319
Longitude: -90.4572
Elevation: 509.7 ft

Temperature-Related Normals

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High: 35.3 40.5 52.3 65.5 74.5 83.3 86.9 86.4 79.5 67.3 53.0 38.9
Mean: 26.7 31.2 41.8 53.4 63.4 72.6 76.1 74.8 66.5 54.8 42.8 30.3
Low: 18.1 22.0 31.2 41.3 52.3 61.9 65.3 63.1 53.5 42.3 32.5 21.6
CDD: 0 0 2 14 79 243 345 305 117 19 1 0
HDD: 1187 945 722 362 129 15 1 3 72 335 668 1077

Number of Days
T090: 0.0 0.0 0.0 0.0 0.6 5.3 9.7 8.3 2.1 0.2 0.0 0.0
T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.5 0.3 0.0 0.0 0.0 0.0
T000: 2.7 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.1
T032: 27.6 23.4 18.8 4.8 0.3 0.0 0.0 0.0 0.1 5.1 15.7 25.7
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Annual Values

High Temp: 63.7 F
Mean Temp: 53.0 F
Low Temp: 42.2 F
Cooling DD: 1124
Heating DD: 5516

Days above 90 (T090): 26.2
Days above 100 (T100): 0.9
Days below 0 (T000): 4.4
Days below 32 (T032): 121.5
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Precipitation-Related Pseudonormals

For stations with short records, linear combinations of normals from nearby sites were used
to compute so-called pseudonormals.

Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prcp: 1.99 1.96 2.99 3.78 4.60 4.66 4.01 3.65 3.29 3.05 3.55 2.53
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Annual Values

Precipitation: 40.06 inches

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KEY:
High - average daily high temperature, degrees F
Mean - average daily mean temperature, degrees F
Low - average daily low temperature, degrees F
CDD - cooling degree days, base 50F
HDD - heating degree days, base 50F
T090 - number of Days with Temperatures above 90 degrees F
T100 - number of Days with Temperatures above 100 degrees F
T000 - number of Days with Temperatures below 0 degrees F
T032 - number of Days with Temperatures below 32 degrees F
Prcp - precipitation, inches
Snow - snowfall, inches
P001 - number of Days with Precipitation of 0.01 inches or more
P010 - number of Days with Precipitation of 0.10 inches or more
P100 - number of Days with Precipitation of 1.00 inches or more
S001 - number of Days with Snowfall of 0.1 inches or more
S010 - number of Days with Snowfall of 1.0 inches or more
S100 - number of Days with Snowfall of 10.0 inches or more

Page Source:
Dr. Jim Angel, State Climatologist
Illinois State Water Survey
Prairie Research Institute
University of Illinois

Data Source:
NOAA National Climatic Data Center